3. The proportion of people who respond to a certain mail-order solicitation is a continuous random variable X that has the density function 1 2 < x < 4, f(x) = {60 %3D 0, elsewhere. Show that P(2 < X < 4) = 1 b) Find the probability that more than 1/5 but fewer than 1/2 of the people contacted will respond to this type of solicitation.

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